JP3424747B2 - Magnetic recording / reproducing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus having a function of recording a cue signal for retrieval on a magnetic tape, and more particularly to a video tape recorder (VTR).
The present invention relates to a magnetic recording / reproducing apparatus capable of discriminating a reproduced portion and a non-reproduced portion of a program recorded on a video tape.

[0002]

2. Description of the Related Art In order to facilitate retrieval during reproduction of a broadcast program recorded on a video tape, a cue signal is usually recorded on the video tape. As an example of this, a magnetic recording / reproducing apparatus capable of repeatedly reproducing data recorded on a magnetic tape has been proposed (JP-A-3-6904).
(See Japanese Patent Publication No. 3). This is a control signal detecting means for setting first and second control signal areas for recording numerical values at arbitrary positions in a repeated portion of a magnetic tape, and for reading the first and second control signals during repeated reproduction. Is provided. Further, it is provided with a unit for writing a numerical value stored in the memory in advance in the control signal area when the first and second control signals are detected, a display unit for displaying the numerical value held in the memory, and the like.
In this magnetic recording / reproducing apparatus, when the first control signal is read from the control signal detecting means during the repeated reproduction, the numerical value is incremented and stored in the memory, and the numerical value is displayed on the display unit. There is. Therefore, it is possible to confirm the frequency of use of the magnetic tape, and to prevent the failure of the VTR due to deterioration of the magnetic tape or the like.

[0003]

By the way, in the above-mentioned conventional magnetic recording / reproducing apparatus, although it is possible to know the numerical value by reproducing 100 times, for example, the data and signals recorded on the magnetic tape are not recorded. It is not a configuration that can identify whether it has been reproduced or not reproduced. For example, set the popular 120-minute video tape to triple speed mode,
If you record the program at random, you can understand to some extent what you recorded about your video tape, but you will not know when it is used by others or after a long time. In such a video tape, only a cue signal indicating the recording start position of the program is written in the control signal area, so if the tape is set during playback and a search operation is performed, the search is performed from the beginning of the recorded program. It Therefore, even if a program that has been once listened to is started to be reproduced, it is necessary to re-watch a program that one does not want to see, and it takes a considerable time to find a desired program. Was there.

The present invention was conceived in view of the above problems, and an object of the present invention is to provide a magnetic recording / reproducing apparatus capable of quickly reproducing a desired program without reproducing a recorded program or the like once viewed. I am trying.

[0005]

In order to achieve the above object, the invention according to claim 1 of the present invention, when recording a signal on a magnetic tape, sets a signal recording start position on the magnetic tape by a control head. In a magnetic recording / reproducing apparatus that records a cue signal and searches for a desired signal recording portion by detecting the cue signal during a cue search, when a video / audio signal is recorded , the cue signal is located at the signal recording start position. And the unreproduced signal,
This unreproduced signal is erased when the unreproduced signal arrives at the control head position during reproduction, and a video / audio signal in which both the cue signal and the unreproduced signal are recorded during the cue search. Select recorded part and search
Then, the reproduction is started . According to the second aspect of the invention, when the signal is recorded on the magnetic tape, the control head records the cue signal at the signal recording start position on the magnetic tape, and at the time of the cue search, the cue signal is detected. In a magnetic recording / reproducing apparatus that searches for a desired signal recording portion by recording a cue signal at the signal recording start position at the time of recording an audio / video signal, the cue signal arrives at the control head position at the time of reproduction. At the time point, a reproduced signal is recorded adjacent to the cue signal, and at the time of a cue search, both the cue signal and the reproduced signal are recorded. A video / audio signal recording portion. It is characterized by skipping and searching for and starting playback .

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an electrical configuration of a magnetic recording / reproducing apparatus according to the present invention. This magnetic recording / reproducing apparatus is applied to a popular type VTR, and records a cue signal in a control signal area 1a of a video tape 1 and makes it possible to search for this cue signal at the time of search. ) Has a function. In the figure, reference numeral 2 denotes a key input section, which is provided with basic input keys such as REC, PLAY, FF and REW. Then, when any of the input keys is operated, a command signal is sent to the control unit 18. Reference numeral 3 denotes a remote control transmitter, which has the same key as the key input unit 2 in the key operation unit, a mode selection key 3a, an unreproduced signal recording key 3b for recording an unreproduced signal in the control signal area 1a, and the recorded signal. An unreproduced signal erasing key 3c for erasing an unreproduced signal is provided.

When any key of the remote control transmitter 3 is operated, a command signal corresponding to the key operation is transmitted from the transmitting section to the VTR side as an infrared signal. 4 is VT
The R receiving unit receives an infrared signal from the remote control transmitter 3 and sends a transmission signal to the control unit 18 side. A mechanical control circuit 5 controls the servo circuit, the recording / reproducing mechanism, and the like based on a command signal from the control unit 18, and executes operations such as recording and reproduction. A display controller 6 displays time, time, operating state, etc. on the display unit 7 formed of a liquid crystal display element under the control of the control unit 18.
A chroma circuit 8 outputs a 3.58 MHz subcarrier signal, which is a reference signal for creating a recording control signal, to the control circuit 9. The control circuit 9 receives the subcarrier signal from the chroma circuit 8, converts it into a recording control signal of 30 Hz, and sends it to the switch 10 and the duty converter 12.

Reference numeral 10 is a switch that is turned on during normal recording,
Reference numeral 11 denotes a switch that is turned on when writing a cue signal and an unreproduced signal. These switches 10, 11
Is turned on / off by a switching signal from the control unit 18. Reference numeral 12 is a duty conversion unit, which receives a control signal from the control circuit 9 and converts the duty to write a cue signal and an unreproduced signal and sends the duty to the switch 11 side. Reference numeral 13 denotes a control head for recording, which is a control circuit 9
Or, receiving the output signal from the duty conversion unit 12,
The control signal is recorded in the control signal area 1a of the video tape 1. When a signal is sent from the control circuit 9, a normal control signal is recorded in the control signal area 1a. On the other hand, when a signal is sent from the duty conversion section 12, a cue signal or an unreproduced signal having a duty ratio different from that of the control signal is recorded.

Reference numeral 14 is a search control head, which detects the control signal, the cue signal, the unreproduced signal, etc. written in the control signal area 1a and outputs them to the amplifier 15. This amplifier 15 has a gain of about 1000 times, and the control head 1
The control signal detected in 4 is amplified and sent to the Schmidt waveform shaping section 16. The Schmitt waveform shaping section 16 is a waveform shaping circuit and shapes the control signal from the amplifier 15 into a square wave and outputs it to the duty conversion detecting section 17. The duty conversion detecting section 17 detects a control signal which is normally recorded, a cue signal which is recorded by changing the duty, and a control signal which is an unreproduced signal and is transmitted at the time of FF / REW. When a binary level of "H" or "L" is detected from the incoming control signal, the detection signal is sent to the control unit 18 side.

The control unit 18 is a microcomputer, which controls the operation of the entire VTR based on a command signal from the key input unit 2 or the remote controller 3, and a video tape during recording or reproduction of video / audio signals. By recording various control signals such as an unreproduced signal and a reproduced signal with respect to 1, the recorded signal reproduced once at the time of the cue search is not searched. In addition, this VT
In the recording mode, R is the control unit 1 as in the popular type.
When 8 is recording the broadcast program on videotape 1,
Normal control signal is changed to control signal area 1a
Automatically write to. At this time, the control unit 18 turns on the switch 10 at a predetermined time interval. Then, a square wave signal with a duty of 60% created by the control circuit 9 on the basis of the subcarrier 3.58 MHz of the chroma circuit 8 is sent to the control head 13 side. As a result, as shown in FIG. 2A, the control signal 19 corresponding to the square wave signal having the duty of 60% is recorded in the control signal area 1a.

Further, when the recording of the broadcast program is started in the recording mode, the control section 18 automatically outputs a cue signal indicating the recording start position and an unreproduced signal for indicating the reproduction completion. Write processing with. At this time, the control unit 18 turns off the switch 10 and turns on the switch 11 twice at short time intervals. Then,
A square wave signal with a duty of 60% created by the control circuit 9 with the subcarrier 3.58 MHz of the chroma circuit 8 as a reference is continuously transmitted to the duty conversion unit 12 side. The duty conversion unit 10 has a duty of 60%.
Each square wave signal of is converted into a square wave signal having a duty of 27% and sent to the control head 13 side via the switch 11. As a result, the control signals 20 and 20 are recorded in the control signal area 1a as shown in FIG. Of the control signal 20, the front stage is a cue signal and the rear stage is an unreproduced signal.

Next, in the reproduction mode, the control unit 18
Performs a process of automatically deleting the unreproduced signal when the reproduction of the broadcast program is started. In this case, when the “H” level signal is input twice from the duty conversion detection unit 17 side to the control unit 18 within a predetermined time, the control unit 18 determines that the cue signal and the unreproduced signal are detected, and the timing is Then, the switch 10 is turned on once. Then, the square wave signal with a duty of 60% generated by the control circuit 9 is sent to the control head 13 side. Therefore, in the control signal area 1a, of the control signals 20 and 20 corresponding to the square wave signal having the duty of 27%, the latter stage side is converted into the normal control signal 19 as shown in FIG. Therefore, the unreproduced signal is erased, and only the control signal 20 indicating the cue signal is left.

The control unit 18 automatically records the unreproduced signal at the start of recording or automatically erases the unreproduced signal at the start of reproduction as described above.
The same processing is performed when b and the unreproduced signal erasing key 3c are operated. When the user operates the unreproduced signal recording key 3b, the control unit 18 sends the same control signal 20 to the subsequent stage of the control signal 20 based on the command signal.
To write. On the other hand, when the user operates the unreproduced signal erasing key 3c, the control section 18 converts the rear side of the control signal 20 into a normal control signal 19 according to the command signal to erase the unreproduced signal. Therefore, when the user records using an ordinary video tape, he or she operates the unreproduced signal recording key 3b while watching the program to write the unreproduced signal, or erases the unreproduced signal when reproducing the program. be able to.

Thereafter, in the search mode, the control unit 18
Performs a process of selecting and searching a signal recording portion in which both the cue signal and the unreproduced signal are recorded. At this time, when the “H” level signal is input once from the duty conversion detection unit 17 side to the control unit 18, the control unit 18 determines that no unreproduced signal has been detected and does not shift to the reproduction mode. Therefore, when the search operation is continued and the "H" level signal is input to the control unit 18 twice within a predetermined time,
When it is judged that an unreproduced signal is detected, the mode is changed to the reproduction mode. Therefore, the reproduction of the program recorded on the video tape 1 is started. Since this program has not been played once, it can be viewed as new by the user.

By the way, the control section 18 also performs a process of writing a reproduced signal adjacent to the cue signal 20 when the cue signal 20 is detected on the control head 14 side in the reproduction mode. At this time, when the "H" level signal indicating the detection of the cueing signal is input from the duty conversion detection section 17, the control section 18 measures the timing and turns on the switch 11 once. Then, the square wave signal converted to the duty of 27% by the duty conversion unit 10 is sent to the control head 13 side via the switch 11. Therefore, as shown in FIG. 2 (B), the control signals 20 and 20 are added to the control signal area 1a.
Is recorded. Of the control signal 20, the front stage is a cueing signal and the rear stage is a reproduced signal.

As a result, in the search mode, the control section 18 skips the signal recording portion in which both the cue signal and the reproduced signal are recorded and performs a search process. At this time, when the "H" level signal is input twice from the duty conversion detection unit 17 side to the control unit 18, the control unit 18 determines that a reproduced signal has been detected and does not shift to the reproduction mode. Therefore, the search operation is continued and the control unit 1
When the "H" level signal is input once to 8, it is judged that the cue signal has been detected, and the mode is changed to the reproduction mode. Therefore, the reproduction of the program recorded on the video tape 1 is started. Since this program has not been played once, it can be viewed as new by the user.

Next, the operation of the magnetic recording / reproducing apparatus will be described. User can buy 3 popular video tapes on the market
A case will be described where the broadcast program is recorded at random in the double speed mode and then reproduced and listened to. For such a video tape, you can understand to some extent what you recorded about what you recorded, but the contents disappear when it is used by others or after a long time. It is normal. If the user wants to watch this video tape for the time being, when the playback operation is performed and the first recording is played back from the beginning, a cue signal indicating the recording start position of each program and an unplayed signal are recorded in the control signal area. Therefore, it is possible to listen in order from the beginning of the recorded program. At this time, the unreproduced signal of the control signal area corresponding to the recorded portion where reproduction is started is erased, but only the cue signal is left.

After a short time after this listening, it is usually unclear which one of the programs recorded on the video tape has been viewed.
When the user wants to listen to the recorded program on this video tape, when the user performs a search operation, the control unit 18 shifts to the search mode, and only the signal recording portion where both the cue signal and the unreproduced signal are recorded. Select and search. For this reason,
The previously played recording is not searched, only the recording that has not been played back is searched, and playback is started from the unplayed recording location. Therefore, it is not necessary to start watching a recording that the user does not want to watch because he / she has already listened, and it is possible to quickly hear only the unreproduced recording. In the above embodiment, the application example of the VTR has been described, but it goes without saying that the VTR can be also applied to the cassette tape recorder.

[0019]

As described above, according to the first aspect of the present invention, the unreproduced signal is erased when the unreproduced signal arrives at the control head position during reproduction of the video / audio signal. at the time of beginning the search, by searching by selecting the video and audio signal recording portion of the two signals of the cue signal and the non-reproduction signal is recorded, to quickly play the program you do not want to acousto-optic before acousto-optic There is an effect that can be done. Further, the invention according to claim 2 records the reproduced signal adjacent to the cueing signal at the time when the cueing signal arrives at the control head position during the reproduction of the video / audio signal, and at the time of the cue search, the head is searched. By skipping the search of the video / audio signal recording part where both the output signal and the reproduced signal are recorded , the previously viewed program is skipped and the desired program is quickly reproduced and viewed. There is an effect that can be done.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing various waveforms of a recording control signal.

[Explanation of symbols]

1 magnetic tape 13 control head 18 Control means

Claims (2)

(57) [Claims] 1. When a signal is recorded on a magnetic tape, a control head records a cue signal at a signal recording start position on the magnetic tape, and at the time of a cue search, a desired signal is recorded by detecting the cue signal. In a magnetic recording / reproducing apparatus for searching a portion, when recording a video / audio signal , a cue signal is recorded at the signal recording start position and an unreproduced signal is recorded, and the unreproduced signal arrives at the control head position during reproduction. and erasing the non-reproduction signal at the time point, at the time of beginning the search, to find and select the video and audio signals <br/> No. recorded portion where both signals are recorded in the cue signal and the non-reproduction signal A magnetic recording / reproducing apparatus characterized by starting reproduction. 2. When a signal is recorded on a magnetic tape, a control head records a cue signal at a signal recording start position on this magnetic tape, and at the time of a cue search, a desired signal is recorded by detecting the cue signal. In a magnetic recording / reproducing apparatus for searching a portion , a cue signal is recorded at the signal recording start position at the time of recording a video / audio signal, and the cue signal is reached at the time when the cue signal arrives at the control head position during reproduction. The reproduced signal is recorded adjacent to, and at the time of the cue search , the reproduction is started by skipping the search of the video / audio signal recording part where both the cue signal and the reproduced signal are recorded. A magnetic recording / reproducing apparatus characterized by: